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We report the finding of time-reversal-symmetry-breaking $d_{x^2-y^2}+id_{xy}$ superconducting ground state in the slave-boson mean-field theory forthe t-J model on triangular lattice. For $t/J=-5$ ($t/J=-9$) pairing exists for$x < 13%$ ($x<8%$) upon electron doping, and $x <56%$ ($x<13%$) upon holedoping. These results are potentially relevant to doped Mott insulatorsNa$_x$CoO$_2$.yH$_2$O and Na$_{1-x}$TiO$_2$.Comment: 3 figures, text polished, to appear in Phys. Rev.

physical review. b, condensed matter and materials physics

Doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>t</mml:mi><mml:mo>−</mml:mo><mml:mi>J</mml:mi></mml:math>model on a triangular lattice: Possible application to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Na</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CoO</mml:mi></mml:mrow><…

Dopedt−Jmodel on a triangular lattice: Possible application toNaxCoO<…